And this is where bipolar surround speakers come in. They diffuse analog surround signals enough to conceal the fact that both surround speakers handle the same signal with Pro Logic. They also provide enough directional cues to take advantage of the fact that, with Dolby Digital and DTS, the surround channels each get separate signals. As the bullets fly in movies such as Eraser, you'll really feel like you're in the middle of the action.
Definitive Technology's bipolar surround speakers are wedge-shaped, with drivers on the angled sides. The middle model in the range, the BPX, has two 5.25-inch bass-midrange drivers and one aluminum-dome tweeter per side. (The top model, the BPVX/P, has larger drivers and two powered subwoofers.) Definitive Technology recommends placing the speakers high on a side wall (or on the rear wall, if listeners will be sitting up against it), and wall-mounting plates are supplied. For $399 each, the BPX speakers come in white, or for $450 apiece, you can have them in glossy black.
The sound was much like that of the matching BP2002TL towers, though with much less bass. The treble found the equilibrium that is so important in surround speakers; its sounds were very natural, yet not so prominent as to call undue attention to the surround effects. All in all, the BPX has an almost ideal balance of frequency and directional characteristics for surround.